That just means a Sotapanna Anugami (or higher) will never lose the Ariya (Noble Person) status, Tobias.
Once born an Ariya (i.e., becomes a Sotapanna Anugami), one will not go back to an “average human” (puthujjana) status. That is why it is in quotes in “never “die”.
– Of course, there will likely be one up to many “physical deaths” until the Arahant stage is attained.
– But he/she is free of the apayas forever.
– Pu it in another way, one has removed the 10 types of miccha ditthi and has started seeing the anicca (and dukkha and anatta) nature of this world.